Stock display (#379)

* Display stock quantity more prominently

* Cleanup search widget

* Update for stock_detail widget

* More tweaks

* Change bottom bar icon

* Display boolean parameters appropriately

* Adds ability to edit part parameters

* Bump icon size a bit

* Improvements to filter options

- Allow filtering by "option" type
- To start with, filter stock by status code

* Remove debug message

* Remove getTriState method

- No longer needed
- Remove associated unit tests

* Adjust filters based on server API version

* Muted colors

lib/widget/part_list.dart

@@ -133,7 +133,13 @@ class _PaginatedPartListState extends PaginatedSearchState<PaginatedPartList> {
     return ListTile(
       title: Text(part.fullname),
       subtitle: Text(part.description),
-      trailing: Text(part.stockString()),
+      trailing: Text(
+        part.stockString(),
+        style: TextStyle(
+          fontSize: 16,
+          fontWeight: FontWeight.bold
+        )
+      ),
       leading: InvenTreeAPI().getThumbnail(part.thumbnail),
       onTap: () {
         Navigator.push(context, MaterialPageRoute(builder: (context) => PartDetailWidget(part)));